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| Author||L. Leydesdorff|
|Title||How are new citation-based journal indicators adding to the bibliometric toolbox?|
|Journal||Journal of the American Society for information Science and Technology|
|Faculty||Faculty of Social and Behavioural Sciences|
|Institute/dept.||FMG: Amsterdam School of Communication Research (ASCoR)|
|Abstract||The launching of Scopus and Google Scholar, and methodological developments in social-network analysis have made many more indicators for evaluating journals available than the traditional impact factor, cited half-life, and immediacy index of the ISI. In this study,
these new indicators are compared with one another and with the older ones. Do the various indicators measure new dimensions of the citation networks, or are they
highly correlated among themselves? Are they robust and relatively stable over time?Two main dimensions are distinguished—size and impact—which together shape influence.The h-index combines the two dimensions and can also be considered as an indicator of reach (like Indegree). PageRank is mainly an indicator of size, but has important interactions with centrality measures. The Scimago Journal Ranking (SJR) indicator provides an
alternative to the journal impact factor, but the computation is less easy.|
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